Thermoelectric property of fine-grained CoSb3 skutterudite compound fabricated by mechanical alloying and spark plasma sintering
Thermoelectric property of fine-grained CoSb3 skutterudite compound fabricated by mechanical alloying and spark plasma sintering
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DOI：
10.1088/0022-3727/40/2/035
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发表时间：
2007-01
期刊：
影响因子：
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通讯作者：
Weishu Liu;Boping Zhang;Jingfeng Li;Li-dong Zhao
中科院分区：
文献类型：
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作者：
Weishu Liu;Boping Zhang;Jingfeng Li;Li-dong Zhao
Skutterudite CoSb3 polycrystalline materials were prepared using a combined process of mechanical alloying (MA) and spark plasma sintering (SPS). The influence of SPS temperature on the thermoelectric properties was focused in this work with a special emphasis on the analysis of the size effects of grains. The average grain sizes decreased from 300 to 50 nm with decreasing SPS temperatures from 600 to 300 °C. The electrical resistivities of samples spark plasma sintered at 300–600 °C all decreased with increasing temperature, indicating a classic intrinsic conduction behaviour of semiconductors. The samples spark plasma sintered at 300–500 °C showed a positive Seebeck coefficient while the sample spark plasma sintered at 600 °C showed a negative Seebeck coefficient. The room-temperature thermal conductivities were reduced from 4.30 to 2.92 W m−1 K−1 as the grain sizes were decreased from 300 to 100 nm corresponding to SPS at 600 and 400 °C, respectively. The present work indicates that MA and SPS is a good combination for fabricating fine-grained CoSb3 thermoelectric materials.
